Explore the concept of checkups for verifying Kubernetes cluster functionality in this 21-minute conference talk from DevConf.CZ 2023. Discover how to ensure your cluster works as expected, especially when using third-party extensions for advanced compute, storage, network, or operational use-cases. Learn about containerized applications that help verify cluster configuration and functionality. Watch a demonstration of a checkup verifying connectivity between two KubeVirt virtual machines and measuring network latency. Understand how to remotely deploy checkups on any cluster and interact with them from execution to results retrieval. Basic understanding of Kubernetes operation is recommended, while knowledge of KubeVirt or networking is not required.